Robbjack ST-341-12-A Corner Chamfer End Mill 3/8 in 3 Flute

Product Description

The ROBBJACK ST-341-12-A is a solid carbide corner chamfer end mill designed for precision chamfering, slotting, side milling, helical interpolation, and ramping operations. It features a 3/8 inch cutting diameter, a 5/8 inch length of cut, and three right-hand helical flutes with a 40-degree helix angle. The tool carries an AlTiN (aluminum titanium nitride) PVD coating applied via physical vapor deposition, which improves heat resistance and extends tool life in demanding cutting applications. The single-end, straight-cylindrical shank measures 3/8 inch in diameter, and the overall length is 2.5 inches. This end mill is suited for roughing and finishing passes where a controlled chamfer edge is required at the corner of a workpiece.

The ST-341-12-A is intended for machining steel, stainless steel, cast iron, superalloys, and titanium, making it appropriate for job shops, tool rooms, and production environments running ferrous and high-temp alloy components. The stub-length geometry and high-helix flute style help maintain rigidity in tight setups. The 45-degree chamfer angle and a chamfer width range of 0.0050 to 0.0070 inches suit applications where consistent, repeatable edge breaks or lead-in chamfers are critical to part quality.

Key Features

• Solid carbide construction for rigidity and wear resistance in ferrous and superalloy materials
• AlTiN PVD coating enhances thermal resistance and tool life at elevated cutting temperatures
• 40-degree high-helix flute geometry supports efficient chip evacuation during slotting and side milling
• 45-degree chamfer angle with 0.0050 to 0.0070 inch chamfer width for controlled edge breaking
• Right-hand cut and right-hand flute direction; centercutting is not supported
• Compatible with helical interpolation and ramping operations in addition to standard end milling

Compatibility

Designed as an OEM-style solid carbide corner chamfer end mill in the ROBBJACK ST-341 series. Primary workpiece materials include steel, stainless steel, cast iron, superalloys, and titanium (material codes P, M, K, S).

Installation Notes

Installation is performed by a qualified machinist or CNC setup technician. Verify that the spindle, collet, or tool holder is clean and within specified runout tolerances before seating the shank. Power down and lock out the machine before changing tooling. Do not use this tool for plunge cutting, as the centercutting feature is not present on this end mill.